Reduce object size a little by using dev_<level>
calls instead of dev_printk(KERN_<LEVEL>.

Other miscellanea:

o Coalesce formats
o Realign arguments
o Use pr_cont instead of naked printk
  reorder test to use "%s\n"
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDominik Brodowski <linux@dominikbrodowski.net>